The word chieftainship is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 27
Highest Scoring Words With Friends™ Play In The Letters chieftainship
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Seven Letter Word Alert: (38 words)
achiest, aitches, aseptic, catfish, catnips, chasten, chipset, ethnics, fancies, fiances, finches, fishnet, haptics, hatches, hatpins, hepatic, hitches, icefish, ichnite, incites, infects, inscape, inspect, pachisi, panfish, panties, patches, patines, pectins, pianist, picante, pinches, pinfish, pitches, sphenic, spicate, spinach, tiepins